Tom isn't a wartime consigliere because he failed to see the play the Turk was making during the failed drug deal offer meeting. Geno would had quietly had more guys guarding the Don immediately after seeing Sonny's outburst at the meeting, because he shown a weakness in the Corleone's armor (greed) and knew that they would make a play to Sonny to by either trying to get him to killed his dad, or have somebody take out Vito and Sonny (hence Geno probably would had upped the security on both to make sure nobody got through.)